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Website speed tests

To test your website's speed, it's a good idea to make sure it's not just your local internet that's causing the issue. By using website speed tests, you can verify other connections are having similar issues.

You can also use free third-party tools to troubleshoot the cause of your site's slowness and to make a plan for your next moves.

To Use Webpagetest.org to Determine Site Slowness

Pick a test location near your server (North American customers, pick a server in North America. European customers, pick a server in Europe. Asian customers, pick a server in Asia).

Select your browser type from the list.

Click Start Test.

Things to look for:

If you see First Byte is slow (longer than 1 second), it indicates slowness at the server itself. This could be because of your site's program code or plugins.

If you see a high number of Requests (more than 100), then your site requires the browser to make a lot of connections to display your site's content. Try to display less content from third-party sites, combine JavaScript and CSS files, use CSS sprites, and enable caching headers to make the browser do less work.

If you see a high number of Bytes in (more than 1,000 KB), then your site requires the browser to download a lot of files before it can display your site's content.

To Use Google PageSpeed to Determine Site Slowness

If your score is an 85 or lower, you have some work to do. Regardless of what's going on at the server, your site will load slowly in the browser.

If your score is an 86 or higher, your site is probably doing well in the browser, but you might still want to investigate with other tools.

In the Suggestion Summary, look for High Priority. This is a customized report for your site and each item has a list of the resources on your page that can be optimized as well as some general information on how to optimize them.

In the Suggestion Summary, review the section labeled Already Done!. This report suggests guidelines to follow to ensure your site is in line with common best practices.

Go to the Grade tab. YSlow creates a customized report for your site. Each item has a list of the resources on your page that can be optimized as well as some general information on how to optimize them.

If your score is a C or lower, you have some work to do. Regardless of what's going on at the server, your site will load slowly in the browser.

If your score is a B or higher, your site is probably doing well in the browser, but you might still want to investigate with other tools.

To Use Pingdom to Determine Site Slowness

If you see a large page size (more than 1 MB), then your site requires the browser to download a lot of files before it can display your site's content.

If you see a high number of Requests (more than 100), then your site requires the browser to make a lot of connections to display your site's content. Try to display less content from third-party sites, combine JavaScript and CSS files, use CSS sprites, and enable caching headers to make the browser do less work.

If you see any 4xx or 5xx errors on the Page Analysis tab, that means your site is referencing a URL that doesn’t exist (cannot be found), or otherwise is generating an error. You should investigate to see which URL is causing the error and fix it.

If you see any 3xx statuses on the Page Analysis tab, that means you're referencing a URL that is causing a redirect (an additional request). You should investigate to see which URL is causing the redirect and fix it.

Under the Page Analysis tab, if you see a large amount of time spent on another domain under Time Spent per Domain, this means another site's content could be slowing down your site in the customer's browser. You should investigate this further.